How to clear message in dmesg with out rebooting the server..

[ashan]

Hi,

I need to find out how to clear message in dmesg with out rebooting the server. Its it possible...?

Best Regards

Ashan

[V.Tamilvanan]

Hi,
I don't think so. Unless you reboot your server it will not get cleared.

[Con O'Kelly]

Sorry I'm not sure about clearing messages from the dmesg buffer without a re-boot.
Don't know if it helps but you can use a "-" flag to dmesg which will only show the messages since it was last run.
i.e # dmesg -
The man page has example for using this in cron.

Cheers
Con

[Bill Hassell]

dmesg is a command to read a specific area of memory in the kernel. This area is a fixed size and old messages drop off once the buffer is full. You could scroll the undesired messsage (and all others before it) out of the buffer with some error message but there is no way to delete a string inside this buffer. This is why you need to create a cron job to read dmesg every few minutes and post the new messages to a logfile. This is an example cron entry to track dmesg (and not lose old entries):

# log kernel diagnostic messages every 10 minutes
05,15,25,35,45,55 * * * * /usr/sbin/dmesg - >>/var/adm/dmesg.log

The secret is to run dmesg with the - option that reports only new information.

[Sridhar Bhaskarla]

Hi Ashan,

If you really want to overwrite the existing dmesg, then you will need to create some errors like filling up a filesystem or forcefully exceeding some kernel parameters like nfile etc.,

You cannot clear the dmesg.

-Sri

[V.Tamilvanan]

Hi Ashan,
Is it something wrong with my reply ??????????